/Engine/Source/Runtime/Core/Public/IO/PackageStore.h
Returns the redirected package ID and source package name for the specified package ID if it's being redirected.
bool GetPackageRedirectInfo ( [FPackageId](API\Runtime\Core\IO\FPackageId) PackageId, [FName](API\Runtime\Core\UObject\FName) & OutSourcePackageName, [FPackageId](API\Runtime\Core\IO\FPackageId) & OutRedirectedToPackageId )